KrAcKeD, you can always try what I did. I didn't get drops for the first several days of the Halloween event. So I said, Frack this, and for fun (because nothing matters anyway right?) I switched out to the most girls I had that looked like demons (for Halloween theme). I switched out to Stephanie for Alpha, Abreal for Beta, and then Beach Samane for Omega, because only 2 looked looked "demonic". After my stamina recharged again, I got both event girls in 9 tries. It was probably all luck, but I was surprised to say the least. Before that, all events I have played so far have at least taken 10~13 days for the 2nd event troll girl to drop. The first girl usually drops in the first 3 to 5 days. Didn't seem to make a sh1t of a difference for normal girls, tho.

KrAcKeD's luck sounds like the guy in a casino playing the same slot machine all day without a single win. Then that one guy comes up when you leave to get a drink, and wins the jackpot with one play on the exact same machine you've been playing at all day. Then you're like, FML!